I'm sorry about the vomiting. This is the one withdrawal symptom that I did not have. Believe me, I've had and am still having all the rest. Ugh.
About a year ago, I started on Vicodin (7.5/325) and then Vicoprofen (7.5/200) and was up to 90 mg a day of the later. Then, I dropped my tolerance down to about 30-45 mg a day of the hydrocodone as my injury moved into a chronic pain state. When I moved to Colorado and saw a new PM doc (after a reinjury), I switched to Percocet (10/325) and eventually got up to 50 mg a day. Not so much really, but its still painful to get off of it. So, I was on narcotic pain relievers for about 12.5 months and while the 90 mg of hydrocodone was only used during the early, acute phase of my herniation (in which it also happened that my wife was having a baby!), I'd say that the 50 mg of oxycodone in the Percs is an accurate assessment of my dependency).
Hope this helps. How many mg of oxy were you on per day?